For those who want to swap a Gen 3 or Gen 4 LS V-8 into a classic 1975-and-earlier car or truck, the Rebel LS system should be at the top of your list of options to investigate, especially if ...

The Gen 4X will also utilize mass air flow sensors in its engine controls, as opposed to the speed density control used on the standard Gen 4 Coyote and Ford's EcoBoost units.